Backert Labs preamp(s)

Has anyone here used a Backert Labs preamp in their system? My current system uses a BHK Signature preamp to drive a pair of BHK Signature 300 monoblocks (using a balanced connection). Backert Labs has a Rhumba Extreme preamp that is in the same price range as the BHK, but also offers a pair of pre outs for recording. I’m considering giving it a try in my system but was wondering if anyone here has any experience with the Backert Labs preamps and, especially, how they might compare with the BHK. Thanks in advance for any information/opinions.